Improvement in balance slide-valves



THOMAS J. HAMER AND MARTIN VALLS, OF SUNBURY, PENNSYLVANIA.

IMPROVEMENT IN BALANCE SLIDE-VALVES'.

Specification forming part of Letters Patent N0. 108,704, dated October 25, 1870.

To all whom it may concern:

Be it known that we, THOMAS J. HAMER and MARTIN WALLS, of the borough of Sunbury, county of Northumberland, and State of Pennsylvania, have invented a new Balance Slide Va1ve, by which the pressure of the steam is equalized; and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawing, and to the letters of reference thereon.

The nature of our invention consists in providing an ordinary slide-valve with a plate fastened, at such a distance above lthe valve as necessity may require to adapt it to the steam-chest used, by means of a sufficient number of studs or bolts securely fastened in the top ofthe valve.

In the top of this plate there isa groove or recess, into which is fitted a ring with steamtight joints. Iuthe recess between the plate and valve beneath this ring are perforations sufficient in number and size to admit a sufticient quantity of steam while working under pressure to sustain the ring against the steamchest lid, and, forming a steam-tight joint ber tween the ring and lid, preventing the passage ofsteanl between the plate and steam-chest lid, the plate to be of sufficient area to relieve the downward pressure on the valve, forming a1- together a complete balance-valve.

Description of the Accompanying Drawing.

Plan A shows the top surface of the' plate withlring adjusted. A A is the Valve. B B B are studs or bolts, by which the grooved plate C C is secured to the valve. D D is the ring or joint. E E are the perfor-ations. F F on Plan A show the surface View of the ring or joint forming a perfect balance slidevalve. j

What we claim as our invention, and desire to secure by Letters Patent, is-

The combination of the perforated grooved plate C with packing ring or joint D F, of any shape, supported above the valve A by the studs or bolts B B, all substantially as and for the purposes set fort-h.

T. J. HAMER. MARTIN VALLS. 

